defending coastline

[magemaster]

Like PvK said, load up on PD. Then continue to expand on land until you build a fortress away from the coast. Build up "land armies" there and take out land provinces. Then you need to capture the coastal provinces. Leave them ALONE until you have a fortress inland. The AI will view you as a bigger threat then independents and attack you. After capturing the provinces' load up on PD and recruit a commander. On the next turn tell him to build a fortress. This will slow down enemy armies-AI keep all units on seige and won't explore farther onto land. This way, while their seiging you, you can build up other armies in other fortresses and shove them back into the ocean. Meanwhile you need to reasearch construction and forge underwater items. To do this you need either a good water or air mage otherwise you have to empower them.